Electrochemical performance of Ni_(1_x)Fe_x-Ce_(0.8)Gd_(0.2)O_(1.9) cermet anodes for solid oxide fuel cells using hydrocarbon fuel

摘要

Ni_(1-x)Fe-x bimetallic-based cermet anodes were investigated for hydrocarbon-fueled solid oxide fuel cells. Ni_(1_x)Fe_x-Ce_(0.8)Gd_(0.2)O_(1.9) cermet anodes were synthesized using a glycine nitrate process, and their electrical conductivity and the amount of carbon deposits were found to decrease with increasing Fe content. The anode polarization resistance for the CH_4 fuel was significantly reduced by Fe alloying, which was strongly related to the carbon deposition behavior. The maximum power density of the single cell with Ni_(0.85)Fe_(0.15)-Ce_(0.8)Gd_(0.2)O_(1.9) in CH_4 at 800 °C was 0.27 W/cm~2. Fe alloying significantly improved the electrochemical performance of solid oxide fuel cells in CH_4 fuel by suppressing carbon deposition.